Session: 03-02: High Temperature Thermal Storage

Paper Number: 142337

142337 - High Temperature Thermochemical Heat Storage System for Industrial Heating Applications 

Abstract: 

Renewable electrification of industrial heating systems could pave the pathways for industrial decarbonization. In these systems, the power generated from renewable sources such as solar and wind is integrated with the industrial processes for which a storage solution is a must to ensure system reliability. The present research focuses on high-temperature (> 1000 ^oC) thermal energy storage of surplus/cheap renewable electricity via a hybrid thermochemical/sensible heat storage with the aid of porous media made of refractory redox metal oxides and electrically powered heating elements. It is suitable for a wide range of industrial process heat temperature requirements including energy-intensive processes. Thermal energy is stored (charging process) by both thermally reducing the reactive porous material and sensibly via electrical heating under atmospheric pressure. The waste heat from the industrial process can also be utilized for partial or complete charging of the storage system depending on its temperature. The stored energy is recovered by oxidation (discharging process) and sensible heating when passing air from the ambient through the porous, high-temperature reactive bed. The heat could be stored from near ambient to high temperatures (> 1000 ^oC) thereby allowing to storage of the low-temperature waste heat in this system.

The CaMnO₃ (calcium manganite) is considered to be the example material for this research. Furthermore, a non-moving structured (e.g. honeycomb, foam, etc.)  reactor that can ensure low-pressure drop, high gas-solid interaction, and mitigation of complexities caused by solid recirculation at high temperatures, is considered. To ensure maximum flexibility of the storage system for integration with several possible industrial applications, an optimal reactor design is of utmost importance. Understanding the hydrodynamics, heat/mass transfer, and chemical transport of the storage module is essential for its proper design and efficient operation. For this purpose, a numerical model to simulate the heat and mass transfer coupled with the chemical kinetics has been developed using ANSYS fluent. This model is used to optimize the geometry of the storage module by performing a parametric study and to predict the storage performance at the laboratory scale. It also includes the numerical modeling of heat transfer within the insulation comprising of multi-layer insulation, for accurate prediction of heat loss through the storage walls.

This research is part of a recently funded project HERCULES through the EU-Horizon Europe program. The ultimate goal is to develop and test a first-of-its-kind prototype system that will demonstrate the applicability of the redox-based high-temperature storage system for industrial heating purposes.

Presenting Author: Jaimy Gebbeken University of Twente

Presenting Author Biography: Name: Jaimy Gebbeken

Institution: University of Twente

Email Address: j.gebbeken@utwente.nl

Authors:

Abhishek Singh University of Twente, Enschede, The Netherlands
Tianchao Xie University of Twente
Nickolas Vlachos Centre for Research & Technology Hellas
Zhen Cao University of Twente
Jaimy Gebbeken University of Twente
Martin Roeb Insitute of Future Fuels, German Aerospace Centre (DLR)
George Karagiannakis ARTEMIS Lab, Centre for Research & Technology Hellas (CERTH)
Christos Agrafiotis Insitute of Future Fuels, German Aerospace Centre (DLR)
Iliana Doliou THERMANSYS P.C.
Kyriakos Fotiadis CENTRE FOR RESEARCH AND TECHNOLOGY HELLAS CERTH